How can Batman: Arkham City look so much better than its unexpectedly great predecessor, Batman: Arkham Asylum? Handsome concept art of Gotham's streets and skylines, both gritty and gorgeous, may provide clues to developer Rocksteady's talent for making Batman look so good.

The developer released a batch of concept art for the this October's Batman: Arkham City today, most of it focused on the game's urban environments and the caped crusader himself. There's a peek at Harley Quinn, but no Robin or the Batmobile in sight.